//
//  Copyright (c) 2012 Rob Napier
//
//  This code is licensed under the MIT License:
//
//  Permission is hereby granted, free of charge, to any person obtaining a
//  copy of this software and associated documentation files (the "Software"),
//  to deal in the Software without restriction, including without limitation
//  the rights to use, copy, modify, merge, publish, distribute, sublicense,
//  and/or sell copies of the Software, and to permit persons to whom the
//  Software is furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//  DEALINGS IN THE SOFTWARE.
//
#import "NSNotificationCenter+RNSwizzle.h"
#import "RNSwizzle.h"

@implementation NSNotificationCenter (RNSwizzle)

typedef void (*voidIMP)(id, SEL, ...);
static voidIMP sOrigAddObserver = NULL;

static void MYAddObserver(id self, SEL _cmd, id observer, 
                          SEL selector,
                          NSString *name,
                          id object) {
  NSLog(@"Adding observer: %@", observer);
  
  // Call the old implementation
  NSAssert(sOrigAddObserver,
           @"Original addObserver: method not found.");
  if (sOrigAddObserver) {
    sOrigAddObserver(self, _cmd, observer, selector, name, 
                     object);
  }
}

+ (void)swizzleAddObserver {
  NSAssert(! sOrigAddObserver,
           @"Only call swizzleAddObserver once.");
  SEL sel = @selector(addObserver:selector:name:object:);
  sOrigAddObserver = (void *)[self swizzleSelector:sel
                              withIMP:(IMP)MYAddObserver];
}
@end
